How to Calculate Force with F = ma

Newton's second law: net force equals mass times acceleration (F = ma). One newton accelerates one kilogram at one m/s².

Step-by-step

1. Identify mass in kilograms (convert from grams if needed).
2. Determine acceleration in m/s² (include direction for vector problems).
3. Multiply: F = m × a.
4. For weight near Earth's surface: W = mg where g ≈ 9.8 m/s².
5. Draw a free-body diagram to identify net force in multi-force problems.
6. Verify with our Force Calculator.

Open the Force Calculator to apply these steps with your own numbers instantly.

Frequently asked questions